Brittany, France 1760. Portrait painter Marianne (Noémie Merlant) is commissioned to paint the wedding portrait of Héloïse (Adèle Haenel), a reluctant bride to be who has just left the convent. The painting must be done in secret, and so Marianne observes her by day and paints by night. Intimacy and attraction grow between the two women but their freedom is short-lived.